/* eslint-disable */
require('script-loader!file-saver')
require('./Blob')
require('script-loader!xlsx/dist/xlsx.core.min')

function generateArray (table) {
  var out = []
  var rows = table.querySelectorAll('tr')
  var ranges = []
  for (var R = 0; R < rows.length; ++R) {
    var outRow = []
    var row = rows[R]
    var columns = row.querySelectorAll('td')
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C]
      var colspan = cell.getAttribute('colspan')
      var rowspan = cell.getAttribute('rowspan')
      var cellValue = cell.innerText
      if (cellValue !== '' && cellValue === +cellValue) cellValue = +cellValue

      // Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null)
        }
      })

      // Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1
        colspan = colspan || 1
        ranges.push({s: {r: R, c: outRow.length}, e: {r: R + rowspan - 1, c: outRow.length + colspan - 1}})
      }

      // Handle Value
      outRow.push(cellValue !== '' ? cellValue : null)

      // Handle Colspan
      if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null)
    }
    out.push(outRow)
  }
  return [out, ranges]
}

function datenum (v, date1904) {
  if (date1904) v += 1462
  var epoch = Date.parse(v)
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}

function sheetFromArrayOfArrays (data, opts) {
  var ws = {}
  var range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}}
  for (var R = 0; R !== data.length; ++R) {
    for (var C = 0; C !== data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R
      if (range.s.c > C) range.s.c = C
      if (range.e.r < R) range.e.r = R
      if (range.e.c < C) range.e.c = C
      var cell = {v: data[R][C]}
      if (cell.v == null) continue
      var cellRef = XLSX.utils.encode_cell({c: C, r: R})

      if (typeof cell.v === 'number') {
        cell.t = 'n'
      } else if (typeof cell.v === 'boolean') {
        cell.t = 'b'
      } else if (cell.v instanceof Date) {
        cell.t = 'n'
        cell.z = XLSX.SSF._table[14]
        cell.v = datenum(cell.v)
      } else {
        cell.t = 's'
      }

      ws[cellRef] = cell
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
  return ws
}

function Workbook () {
  if (!(this instanceof Workbook)) return new Workbook()
  this.SheetNames = []
  this.Sheets = {}
}

function s2ab (s) {
  var buf = new ArrayBuffer(s.length)
  var view = new Uint8Array(buf)
  for (var i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF
  return buf
}

export function exportTableToExcel (id) {
  var theTable = document.getElementById(id)
  console.log('a')
  var oo = generateArray(theTable)
  var ranges = oo[1]

  /* original data */
  var data = oo[0]
  var wsName = 'SheetJS'
  console.log(data)

  var wb = new Workbook(), ws = sheetFromArrayOfArrays(data)

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges

  /* add worksheet to workbook */
  wb.SheetNames.push(wsName)
  wb.Sheets[wsName] = ws

  var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'})

  saveAs(new Blob([s2ab(wbout)], {type: 'application/octet-stream'}), 'test.xlsx')
}

// function formatJson (jsonData) {
//   console.log(jsonData)
// }

export function exportJsonToExcel (th, jsonData, defaultTitle) {
  /* original data */

  var data = jsonData
  data.unshift(th)
  var wsName = 'SheetJS'

  var wb = new Workbook(), ws = sheetFromArrayOfArrays(data)

  /* add worksheet to workbook */
  wb.SheetNames.push(wsName)
  wb.Sheets[wsName] = ws

  var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'})
  var title = defaultTitle || '列表'
  saveAs(new Blob([s2ab(wbout)], {type: 'application/octet-stream'}), title + '.xlsx')
}
